I would say thinks with the lable Titanum, Bulkpaq, Budget, Princo in general, Gigamaster, Gigatain, Esperanza, Extreme. Most of these media would be hard to find.
But some of these brands also use B-/C-Grade-media from good manufacturers, sometimes.
And most of actual MBI and Falcon (if the info in this forum is right only the Non-Pro od Falcon is crappy)